ExtMVC.ViewportBuilder = function(config) {
	this.initialConfig = config;
};

ExtMVC.ViewportBuilder.prototype = {

	/**
	 * Abstract function which should be overridden by your implementation
	 * @param {ExtMVC.OS} os A reference to the OS.  Usually a builder would set 
	 * os.viewport = new Ext.Viewport({...}) and return the os at the end of the function
	 * @return {ExtMVC.OS} The operating system as passed in parameters after viewport is built
	 */
	build	: Ext.emptyFn
};
